The double bass is considered one of the deepest-sounding instruments and is designed in various ways. Depending on the playing technique, it can be put into oscillation. These include plucking, bowing and slapping. Not only does the playing technique change the sound, but also do different string sets. This thesis raises the question as to what extent the sound quality of double basses can be measured by means of physics. Furthermore, it will be examined if the sound quality is influenced in terms of different materials, string sets, and playing techniques. The thesis starts with a brief historical overview about the evolution of the double bass, which serves as an introduction to the topic. Moreover, relevant physical principles will be explained. In order to answer the research questions, diverse sound spectra will be recorded. The results show that the double bass designed with a more high-grade wood and diverse string-material composition reflects a recorded overtone spectrum more clearly than the lower-quality model. With respect to this instrument, not only a higher sound pressure level could be measured, but also a slower decay behavior was detected. When comparing different playing techniques on two double basses, no measurable difference was found.